1. Laboratoire de Physique et Chimie de l’Environnement et de l’Espace (LPC2E), CNRS, 45071 F-Orléans, France
2. Department of Physics, Imperial College London, Prince Consort Road, London, SW7 2AZ, UK
3. Department of Physics, University of Oslo, Box 1048 Blindern, 0316 Oslo, Norway
4. Laboratoire de Physique des Plasmas, Ecole Polytechnique/CNRS/Sorbonne Université, 4 Place Jussieu, F-75252 Paris, France
5. Swedish Institute of Space Physics, PO Box 812, SE-981 28 Kiruna, Sweden
6. Institutet för rymdfysik, Ångstrom Laboratory, Lagerhyddsvagen 1, SE-75237 Uppsala, Sweden
7. Institut für Geophysik und extraterrestrische Physik, TU Braunschweig, Mendelssohnstr. 3, D-38106 Braunschweig, Germany
8. Southwest Research Institute, PO Drawer 28510, San Antonio, TX 78228-0510, USA
9. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
10. LAPLACE, Universite de Toulouse, CNRS, F-31062 Toulouse, France